Given a sorted dictionary of an alien language having N words and k starting alphabets of standard dictionary the task is to complete the function which returns a string denoting the order of characters in the language..

Note: Many orders may be possible for a particular test case, thus you may return any valid order.

Input:
The first line of input contains an integer T denoting the no of test cases. Then T test cases follow. Each test case contains an integer N and k denoting the size of the dictionary. Then in the next line are sorted space separated values of the alien dictionary.

Output:
For each test case in a new line output will be 1 if the order of string returned by the function is correct else 0 denoting incorrect string returned.